Window sash extrusion



FIG. 1 is a perspective view of a window sash extrusion showing our new design; and,

FIG. 2 is an end elevation view thereof.

The broken lines shown in the figures are included for the purpose of illustrating portions of the window sash extrusion that form no part of the claimed design.

The window sash extrusion is shown with a symbolic break in its length. The appearance of any portion of the article between the break forms no part of the claimed design. 

CLAIM The ornamental design for a window sash extrusion, as shown and described. 